Tapping fittings
AssigneePlasson Maagan Michael Industries Ltd.
InventorOded Katz
Life of this patent
Estimating the term…
Abstract
A tapping fitting for a pipe, preferably a plastic pipe, includes a rotatable blade assembly threaded within a sleeve non-rotatably received within a housing such that rotation of the blade assembly causes it to cut a cylindrical slug from the pipe to which the housing is attached. The opposite faces of the sleeve are exposed to the fluid pressure within the pipe thereby producing a balance of forces substantially eliminating transverse creep. In addition, the attaching section of the fitting is formed with a bore which is engageable by a sealing ring received around the rotatable blade assembly and which is of sufficient length to accommodate any axial creep, thereby enabling the blade assembly also to serve as a valve.
Claims20
A tapping fitting for application to a pipe in order to tap a fluid conducted therethrough to an ancillary device comprising:
- a housing including a main section, an attaching section in axial alignment with the housing main section for attaching the fitting to a pipe, and an outlet section for directing the fluid from the pipe to the ancillary device;
- a rotatable blade assembly having external threads threadedly received within said housing main section and including a cylindrical cutting blade such that rotation of the blade assembly moves it axially from an initial, retracted position within the housing main section to a projected position through said attaching section to cut a cylindrical slug from the pipe to which the attaching section is attached;
- and a sleeve interposed between said rotatable blade assembly and said housing main section, said sleeve being non-rotatable with respect to said housing main section and having internal threads threadedly receiving said external threads of the rotatable blade assembly such that rotation of the rotatable blade assembly moves it to its projected position as it cuts said cylindrical slug from the pipe, the opposite faces of said sleeve being exposed to the fluid pressure within said pipe, after said cylindrical slug has been cut therefrom, to produce a balance of forces on the opposite faces of the sleeve reducing transverse creep in said sleeve.
A tapping fitting for application to a pipe in order to tap a fluid conducted therethrough to an ancillary device, comprising:
- a housing including a main section, an attaching section in axial alignment with the housing main section for attaching the fitting to a pipe, and an outlet section for directing the fluid from the pipe to the ancillary device;
- and a rotatable blade assembly having external threads threadedly received within said housing main section and including a cylindrical cutting blade such that rotation of the blade assembly moves it axially from an initial, retracted position within the housing main section to a projected position through said attaching section to cut a cylindrical slug from the pipe to which the attaching section is attached;
- said rotatable blade assembly including a mounting head at one end formed with said external threads, said mounting head having a bore of non-circular cross-section;
- said fitting further including a stem of corresponding cross-section as said bore and received in said bore for rotatating said rotatable blade assembly;
- said mounting head being formed with an inwardly-extending projection received within an axially-extending slot in said stem, which slot terminates in a stop engageable by said projection in the projected position of the rotatable blade assembly.
A tapping fitting for application to a pipe in order to a tap fluid conducted therethrough to an ancillary device, comprising:
- a housing including a main section, an attaching section in axial alignment with the housing main section for attaching the fitting to a pipe, and an outlet section for directing the fluid from the pipe to the ancillary device;
- and a rotatable blade assembly having external threads threadedly received within said housing main section and including a cylindrical cutting blade such that rotation of the blade assembly moves it axially from an initial, retracted position within the housing main section to a projected position through said attaching section to cut a cylindrical slug from the pipe to which the attaching section is attached;
- said attaching section having a bore of a diameter slightly larger than the outer diameter of said cylindrical cutting blade and of a length to accommodate axial creep in the housing;
- the outer surface of said cylindrical cutting blade carrying a sealing ring received within said bore in the projected position of said blade assembly and in sealing contact with the surface of said attaching section defining said bore, thereby enabling the blade assembly to serve as a valve opening the passageway from said pipe to said ancillary device when the blade assembly is in said retracted position, and closing said passageway when the blade assembly is in said projected position by the sealing contact of said seal with said surface of the attaching section defining said bore along the length of the bore despite the presence of axial creed in the housing.
Dependencies are inferred from the claim text.